Treatment of lemon-juice.



UNITED STATES PATENT oiuuon.

AUGUSTE FERNBACH, OF PARIS, FRANCE.

TREATMENT OF LEMON -J UICE.

No Drawing.

T 0 all whom it may concern:

Be it known that I, AUcUsTn FERNBAOH, a citizen of the Republic ofFrance, residing at 26 Rue Dutot,-Paris, XV, France, have inventedacertain new and useful Treatment of Lemon-Juice, of which the followingis a specification.

Lemon juice as it is obtainedby expressing the fruits is eminentlyalterable. It is not only liable to be attacked by diversemicro-organisms, among which molds are predominant, but before it hasundergone any alteration'due to this cause it suffers a deeply sea-tedmodification of taste and odor due to oxidation. This is convincinglyshown when fresh lemon'juice is allowed to rest for several hours. Forthese reasons it has not hitherto been possible to preserve lemon juice.in such a condition that it is adapted for the preparation of lemonadecomparable in freshness of taste and aroma with that which can be madefrom the fresh juice. The facility with which the fresh juice oxidizes,particularly at a temperature relatively high, explains why pasteurizedlemon juice is possessed of a disagreeable taste and odor which oftenrender it unsuitable for consumption.

The present invention relates to a process by which the preservation oflemon juice becomes possible and a product is obtained having all theproperties of the fresh juice. The process consists essentially in theconcentrationof the lemon juice under diminished pressure.-

The fresh lemon juice is first filtered fo the purpose of straining itfrom all sus pended matter. It is then introduced into suitableapparatus which may be an ordinary -vacuum pan and constructed of amaterial which is not attacked by the juice, in which apparatus thepressureis diminished to such a degree that the water in the juice canbe distilled at a temperature not exceeding 35 C. This temperature issufficiently low'to prevent any modification of the taste of the juice.In order to avoid completely all oxidation prejudicial to the qualitg ofthe final product, a current of pure car on d1ox1d 1s Specification ofLetters Patent. Application filed June 23, 1910. Serial N 0. 568,552.

passed through the juice both during the operations which precede itsconcentration and during the concentration itself. Theconmicro-organisms. The product thus obtained is completely sterile.After a suit able quantity of essence of lemons in alcoholic solutionhas. been added to take the place of the volatile aromatic productsWhich have disappeared during the concentration, the product may bepreserved indefinitely in suitable receivers.

Experience shows thatif the product be diluted with an appropriatequantity of water all the properties of fresh lemon juice are restored.

Having thus described the nature of my said invention and thebest meansI know of carrying the same into practical effect, I

- claim 1. A process of treating lemon juice, which process consists-infirst filtering the fresh juice in an atmosphere of pure carbon dioxidand then concentrating the filtered juice at a low temperature underdiminished pressure and in a current of pure carbon dioxid.

2. A process of treating lemon juice, which processconsists in firstfiltering the fresh juice in an atmosphere of pure carbon dioxid, thenconcentrating the filtered juice at a low temperature under diminishedpressure and in a current of pure carbon dioxid, and then adding essenceof lemons dissolved in alcohol.

In testimony whereof I have signed my 1 name to this specification inthe two subscribing witnesses.

AUGUSTE FERNBACH. 8.

Witnesses:

H. O. Coxn, JACK H. BAKER.

presence of Patented Jan. 10, 1911-.

